package com.yanzhen.cnm;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

public class zhangjie {
    public static void main(String[] args) {
        ThreadLocal<String> threadLocal1 = new ThreadLocal<>();
        threadLocal1.set("张杰吃屎");
        ThreadLocal<List> threadLocal2 = new ThreadLocal<>();
        System.out.println(threadLocal1.equals(threadLocal2));
        HashSet<Object> hashSet = new HashSet<>();
        HashMap<String, Object> hashMap = new HashMap<>();
        ConcurrentHashMap concurrentHashMap = new ConcurrentHashMap();
        Hashtable<Object, Object> hashtable = new Hashtable<>();
        ArrayList<String> list = new ArrayList<>();
        System.out.println("     ");
        char a='a';
        System.out.println((double)(a));

    }
}
